<!DOCTYPE html>
<html lang="en">
<head>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.12"></script>
</head>
<body>
    <div id="app">
        <span>第一章内容</span>
        <p style="white-space: pre-line;">{{message}}</p>
        <textarea v-model="message"></textarea>
    </div>
    <script>
        new Vue({
            el:'#app',
            data:{
                message:""
            }
        })
    </script>
</body>
</html>